Thread-controlling device for sewing-machines.



R. MOFFATT & R. s. KBLSO. THREAD GGNTROLLING DEVICE FOR SEWING MACHINES.

AIPLl'UATION FILED OUT. 16, 1911.

Patented Aug. 26, 19134 3 SHEETS-SHIET 1.

J, R. MOPFATT KELSO. THREAD SONTROLLING DEVICE FOR SEWING MACHINES. APPLIOATLON TIL-EU G03. 16, 1911 1 ,07 1 ,45 1 Patented Aug. 26,1913.

- 3 SHEETS-SHEET2 J. R. MOFFATT & R. S KELSG.

THREAD CONTROLLING DEVICE FOR SEWUJG MACHINES.

APPLIOATIGN FILE}? 00?.15, 191 1 Q? l 45 1 Patented A125. 26, 1913.

' 3 SHBETB' SHEET @wuwcooeo UNITED STATES PATENT OFFICE.

JAMES B. momwrr AND RALPH s. KELso, or CHICAGO, xrmnors, AssmNons T0 UNION SPECIAL MACHINE commnmor cmoaeo, ILLINOIS, A, CORPORATION or ILLINOIS.

THnEAn-coNTRoLLiNG nEvxcn ron. SEWING-MACHINES,

Specification of Letters Patent.

PatentedAug, 26, 1913'".-

Applicationfiled October 16, 1911-. Serial No. 654,865,v

Cook and. Stateof- Illinois, have invented certain new and useful Improvements in Thread-Controlling. Devices for Sewing- Machines, of which. the following is a descniption, reference-being had to the alccomrpa-nyingdrawing and to the letters and fig.- ures-of reference marked thereon.

Our invention relates toimprovements in sewin machines, and particularly to athrea -c0ntrolling device therefor; been designedespecially for use in. connection with the Union Special Side Wheel Cyliiider Machine, such as'illmtrated in United- States PatentNo.,583,415, granted Ma 25, 1897, and is more especially adapte for machines of this character used for the-manufacture of high grade shirts. Manufacturers of these shirts use a very fine thread, and iii-removing the work, the-looper thread sometimes breaks, because it is clamped by the nipper springs. The use of a fine looper thread is desirable, because it improves the appearance of the seam, and reduces any tendency to make an unsightly ridge.

The inventionv consists in the matter hereinafter described and referred to in the ap- I pended claims.

The invention is illustrated in the accompanying. drawings, in which Figurel is a side view of a side wheel cylinder sewing machine embodying our invention; Fig. 2'is a plan view; Fig. 3 is a diagrammatic view, illustrating the tension-1e leasing devices and operating means there for; and Fig. 4 is a detail .iew of the nip- -per springs, together with a,v1ew of the linger 19 operating the-upper one of said springs, the two positions of the finger and upper nipper spring being shown respec:

. tively in full and dotted lines.

. In these drawings, the machine as a whole is of the type shown in the above mentioned patent, and is marked 1. It has the presser foot 2, presser bar 3, presser bar lever 4, needlethread tensions 5-, looper thread tensions 6, and upper and lower nipper springs 7, 8, all of the usual construction.

.The nipper springs 7 and-8 are caused to grip the thread'by a rotating cam 8 carried It has bythe main shaft in the manner well known in-this type of machine, This cam is formed with oneflat or cut-away side, 'so that the. springs are intermittently operated to grip the thread;

Connected: at one end to the presser bar leverby the adjustable plate 9, is a bell crank-lever 10,-pi'voted on the machine frameby. the spring 16. Thisrod is guided by the-clips 17, which aresecu'red, to the machine'fiamo. Adjacent the lower end, thisrod has an arm 18, formed, as shown, at its outer end. with avertical-212111.19, which in the-upward movement of the rod 15 engages the upper nipper spring 7 and forces it upward to release the looper thread. Attached to this arm 18 is the arm 20, having the two fingers 21 to eng ge and open the tension disks 6. The parts are so timed that when the. presser bar lever 4 is drawn down, the bell crank lever 10 swings, releasing the use dle thread tension disks, and simultaneously the rod 15 is raised vertically and the looper thread tensions and nipper springs also re leased from pressure on the thread, so that when the presser foot is raised from the work for the purpose of removing the material, all strain on both threads isrelieved.

From the above description it will be apparent that the cam for closing the nipper springs 7 and 8 engages the lower spring 8, While the manually operated device 19 en-- gages the upper spring 7, and, therefore, the nipper springs may be separated, although the cam is in position, to cause-said springs to grip the thread.

It will be understood that parts not herein described are of usual well known construction, and that while we have shown two looper threads and two needle threads, and the consequent number of tensions, oneormore may be used.

Having thus described our invention, whatits inner end has per springs, a cam engaging one 0 we claim as new and desire to secure by Letters Patent, is

, 1. In a'sew-ing machine having thread controlling devices, including coiiperating members for nippinithe thread, meanlsl engaging t e same to.

one of the mem ersfor causin nip the thread, and manua ly operated means for engaging the other member to move the same to release the thread.

2. In a sewing machine having thread controlling devices, including coiiperatin nipsaid springs for movin the same to nip the thread, and manua ly operated means for engaging the other spring for moving the same to release the thread.

3. In a sewing machine having thread-con trolling devices including a tension device and am intermittent. thread nipping device acting 'on the same thread'as the tension. de vice, means manually controlled by the operator for simultaneously releasing the tension and nipping devices.

4. In a sewing machine having thread contrcllin devices including needle thread tensions, Io

at the will of the operator.

5. In a sewing machine having thread-controllin devices including needle thread ten-- sions, ooper thread tensions, and an intermittently acting nipping device. for the oper thread tensions, and an inter-. mittently acting nipping device, and means for simultaneously releasing all said devices taneously acting nipping device for thelooper thread, a presser foot, and means for simultaneously releasing the needle and looper thread tensions and the nipping device, as the presser foot is raised.

7. In a sewing machine having thread-controllin devices including needle thread tensions, ooper thread tensions,and an intermittently acting nippin device for the looper thread, and a si'ng e levercontrolled by the operator for releasing all of said devices simultaneously.

8. In a sewing machine having thread-controlling devices includin needle thread tensions, looper thread tensions, and an inter? mitbent-ly acting nipping device for the looper thread, afpresser oot, and a single lever controlled by the operator for simultaneously raising the presser foot and releasing all of said devices.

In testimony whereof we afiiirour signatures, in -presence of two witnesses.

JAMES R. MOFFATT. RALPH S. KELSO. Witnesses:

C. L. STURTEVANT, C. MCNEIL. 

